Abstract:
We review the various computations of the ratio of the mass gap M to the Λ-parameter entering the perturbative computations of amplitudes at high energies in the O(n) non-linear σ-model. In particular we reproduce from original notes of H. Lehmann his computation of this ratio in the (next–to) leading order of the 1/n expansion.
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Received: 23 March 2000 / Accepted: 10 April 2000
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Weisz, P. Computations of ¶in the 2-d O(N) Non-Linear σ-Model. Commun. Math. Phys. 219, 45–56 (2001). https://doi.org/10.1007/s002200100407
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DOI: https://doi.org/10.1007/s002200100407